While being serious at most times, she has her despairing moments, most of which happen when she thinks Yume is going to leave her or when she thinks Yume is ignoring her. She is very, very deeply in love with Yume and seems to be a bit insecure about Yume's feelings for her.
Despite Hinata's warnings that coddling Yume is a bad thing, Yuuki explains (with a rather sly and sinister expression) that as long as Yume is dependent on her in some way, she will be fine.
Unlike the rest of the workers, she does not have a hard time dealing with the pushy customers, an attribute which Yume seems to find attractive.
Vova
